<template>
  <div class="wrap">
    <!-- 商品分类导航 -->
    <div class="type-nav">
      <div class="container" @mouseenter="mouseIn" @mouseleave="mouseOut">
        <h2 class="all">全部商品分类</h2>
        <nav class="nav">
          <a href="###">服装城</a>
          <a href="###">美妆馆</a>
          <a href="###">尚品汇超市</a>
          <a href="###">全球购</a>
          <a href="###">闪购</a>
          <a href="###">团购</a>
          <a href="###">有趣</a>
          <a href="###">秒杀</a>
        </nav>
        <div class="sort" v-show="isShow">
          <div class="all-sort-list2">
            <!-- 一级导航 -->
            <div
              class="item"
              v-for="c1 in categoryList"
              :key="c1.categoryId"
              :class="{ cat: heightLight === c1.categoryId }"
              @mouseenter="handleMouseenter(c1.categoryId)"
              @mouseleave="handleMouseleave"
            >
              <h3 @click="clickGoSearch(c1, 'one')">
                <a>{{ c1.categoryName }}</a>
              </h3>
              <!-- 二级导航 -->
              <div
                class="item-list clearfix"
                v-show="heightLight === c1.categoryId"
              >
                <div
                  class="subitem"
                  v-for="c2 in c1.categoryChild"
                  :key="c2.categoryId"
                >
                  <dl class="fore">
                    <dt @click="clickGoSearch(c2, 'two')">
                      <a>{{ c2.categoryName }}</a>
                    </dt>
                    <!-- 三级导航 -->
                    <dd>
                      <em v-for="c3 in c2.categoryChild" :key="c3.categoryId">
                        <a @click="clickGoSearch(c3, 'three')">{{
                          c3.categoryName
                        }}</a>
                      </em>
                    </dd>
                  </dl>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  </div>
</template>
<script>
import _ from "lodash";
import { mapState } from "vuex";
export default {
  name: "TypeNav",
  components: {},
  data() {
    return {
      heightLight: "-1",
      //列表显示与隐藏
      isShow: true,
    };
  },
  computed: {
    ...mapState({
      //store 模块式开发取值
      categoryList: (store) => {
        return store.home.categoryList;
      },
    }),
  },
  created() {
    if (this.$route.path === "/search") {
      this.isShow = false;
    }
   
  },
  methods: {
    //  鼠标移入 显示
    //使用lodash 进行节流
    handleMouseenter: _.throttle(function (id) {
      this.heightLight = id;
    }, 30),
    //鼠标移出
    handleMouseleave() {
      this.heightLight = "-1";
    },
    //点击一级二级三级 实现路由跳转到search到页面
    clickGoSearch(a, b) {
      /* 
                  a ---- item 传过来的参数
                  b ---- 用来判断级别 一级 one 二级 two 三级 three
             */
      let params = {};
      params.categoryName = a.categoryName;
      if (b === "one") {
        params.category1Id = a.categoryId;
      } else if (b === "two") {
        params.category2Id = a.categoryId;
      } else {
        params.category3Id = a.categoryId;
      }
      this.$router.push({
        path: "/search",
        query: params,
      });
    },
    //鼠标移入 显示 一 二 三 级导航
    mouseIn() {
      this.isShow = true;
    },
    //鼠标移出 隐藏 一 二 三 级导航
    mouseOut() {
      this.heightLight = "-1";
      if (this.$route.path !== "/home") {
        this.isShow = false;
        
    }
    },
  },
};
</script>
<style scoped lang='less'>
.type-nav {
  border-bottom: 2px solid #e1251b;

  .container {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    position: relative;

    .all {
      width: 210px;
      height: 45px;
      background-color: #e1251b;
      line-height: 45px;
      text-align: center;
      color: #fff;
      font-size: 14px;
      font-weight: bold;
    }

    .nav {
      a {
        height: 45px;
        margin: 0 22px;
        line-height: 45px;
        font-size: 16px;
        color: #333;
      }
    }

    .sort {
      position: absolute;
      left: 0;
      top: 45px;
      width: 210px;
      height: 461px;
      position: absolute;
      background: #fafafa;
      z-index: 999;

      .all-sort-list2 {
        .item {
          h3 {
            line-height: 30px;
            font-size: 14px;
            font-weight: 400;
            overflow: hidden;
            padding: 0 20px;
            margin: 0;

            a {
              color: #333;
            }
          }

          .item-list {
            // display: none;
            position: absolute;
            width: 734px;
            min-height: 460px;
            background: #f7f7f7;
            left: 210px;
            border: 1px solid #ddd;
            top: 0;
            z-index: 9999 !important;

            .subitem {
              float: left;
              width: 650px;
              padding: 0 4px 0 8px;

              dl {
                border-top: 1px solid #eee;
                padding: 6px 0;
                overflow: hidden;
                zoom: 1;

                &.fore {
                  border-top: 0;
                }

                dt {
                  float: left;
                  width: 54px;
                  line-height: 22px;
                  text-align: right;
                  padding: 3px 6px 0 0;
                  font-weight: 700;
                }

                dd {
                  float: left;
                  width: 415px;
                  padding: 3px 0 0;
                  overflow: hidden;

                  em {
                    float: left;
                    height: 14px;
                    line-height: 14px;
                    padding: 0 8px;
                    margin-top: 5px;
                    border-left: 1px solid #ccc;
                  }
                }
              }
            }
          }
        }
        .cat {
          background: rgb(135, 135, 206);
        }
      }
    }
  }
}
</style>